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RISS 인기검색어
- 검색키워드
- 저자 : Choudhury U. K. (검색결과 2 건)
- 무료
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Muralidhar Bathula V. A. S.,Sharma D. K.,Choudhury U. K.,Rao V. V. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3
High temperature superconducting (HTS) synchronous machines are compact and light weight machines with higher torque to weight ratio, lower noise and better dynamic response for strategic and critical industrial applications. The development of HTS fi eld coil is one of the main technological challenges in realizing the HTS synchronous machines, as it involves the selection of HTS tape, winding technology, handling of the HTS tape while winding on a winding machine and testing of the developed HTS coil at desired cryogenic temperatures. With advancements in HTS tape technology, recent 2G HTS tapes are off ered with higher engineering current densities with respect to 1G HTS tapes even at higher magnetic fi elds. Hence, the replacement of 1G HTS fi eld coils of previously designed 200 kVA HTS synchronous machine with 2G HTS fi eld coils at the same operating cryo-temperature shows a potential to enhance its capacity to 350 kVA (more than 75% increase in machine output). In the present work the details of design, development and testing of a double pancake type 2G HTS fi eld coil are presented for capacity enhancement of earlier 1G based 200kVA HTS synchronous machine.
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S. Thadela,B V A S Muralidhar,B Kalyani,U K Choudhury,S N Yadav,V. V. Rao 한국초전도.저온공학회 2018 한국초전도저온공학회논문지 Vol.20 No.4
Torque tubes in High Temperature Superconducting (HTS) motor transfer torque from superconducting field winding rotor to the room temperature shaft. It should have minimum heat conduction property for minimizing the load on cryo-refrigerator. Generally, these torque tubes are made with stainless steel material because of high strength, very low outgassing and low thermal contraction properties at cryogenic temperatures and vacuum conditions. With recent developments in composite materials, these torque tubes could be made of composites such as Kevlar and S-Glass, which have the required properties like high strength and low thermal conductivity at cryogenic temperatures, but with a reduced weight. Development and testing of torque tubes made of these composites for HTS motor are taken up at Bharat Heavy Electricals Limited (BHEL), Hyderabad in collaboration with Central Institute of Plastics and Engineering Technology (CIPET), Chennai and Indian Institute of Technology (IIT), Kharagpur. As these materials are subjected to vacuum, it is important to measure their outgassing rates under vacuum conditions before manufacturing prototype torque tubes. The present study focusses on the outgassing characteristics of Kevlar and S-Glass, using an Outgassing Measurement System (OMS), developed at IIT Kharagpur. The OMS facility works under vacuum environment, in which the test samples are exposed to vacuum conditions over a sufficient period of time. The outgassing measurements for the composite samples were obtained using pressure-rise technique. These studies are useful to quantify the outgassing rate of composite materials under vacuum conditions and to suggest them for manufacturing composite torque tubes used in HTS motors.
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